Some web-sites that could be useful if you were thinking about researching the way presentation could shape an audience's reaction to art work.

Good iron mongers offer a wide range of fixings and fittings
http://www.ironmongerydirect.co.uk/

http://www.choiceful.com/shop-online-Fixings.html

http://www1.westfalia.net/shops/tools/ironmongery/tensioning_rope/tensioning_ropes/

Look at builders supplies as well
http://www.screwfix.com/

http://www.ebuildingsupplies.co.uk/page/home

Delicate and unusual wire meshes etc
http://www.wires.co.uk/?gclid=CKPDgLKJ5pgCFQyjQwodlXAxbQ

More architectural scale wire
http://www.steelwirerope.com/General%20Wire%20Rope/StainlessSteelWireRope.html?gclid=CKDE48KJ5pgCFQo1QwodZmKKcA

For coloured ropes and climbing fixtures
http://www.inglesport.com/shop/catalog.php?category=SRT%20Ropes

Swivels and links etc
http://www.seafishingsupplies.co.uk/index.php?cPath=59_109

If you are thinking about using commercial style signage or text
http://www.fastsigns.co.uk/England-WestYorkshire-Leeds-store857.html

Building walls? Plywood, chipboard, blockboard or MDF
http://www.boardcraft.co.uk/products.asp

Lighting
http://www.pegasusassociates.com/products/ArtGalleryLighting/ArtGalleryLighting.html

Display cabinets
http://www.displaysense.co.uk/display-cabinets?gclid=CML7mN2V5pgCFQpNQwodRQ8ecg